Last-lock.



w. A; KRENTLER.

LLLLLLL K. APPLIOA'I'IOH HLED NOVA 11111 B.

UNITED STATES PATENT OFFICE.

WALTER A. KRENTLER, OF DETROIT, MICHIGAN, ASSIGNOR TO KBENTLER-ARNOLD HINGE LAST COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

LAST-LOCK.

To all whom it may concern:

Be it known that I, WALTER A. KRENTLER, a citizen of the United States, and resident of Detroit, in the county of lVayne and State of Michigan, have invented an Improvement in Last-Locks, of which the following description, in connection with the accompanying drawings, is a specification, like numerals on the drawings representing like parts.

Divided or hinged lasts, in which the heel-part swings or slides with relation to the forepart, require a positive locking device, or at least it is desirable to use a lock in connection with them. Many locks have been proposed, and my present invention aims to provide a lock which will not require special machining or fitting of the lastparts, and which will not become inoperative because of the shrinkage or drying of the wood, but will remain strong. and positive until the last is worn out.

According to my invention I provide one last-part with simply a swinging eccentric engaging-member, having its aXis extending lengthwise of the last, and swinging to engage beneath a stud, shoulder or button set in the other last-part opposite said aXis. My preferred construction consists of a hole in one last-part in which is mounted a rotary post or bolt, and a hole in the other lastpart in which is mounted a round-headed tack or the like for receiving the outer end of said belt, which is beveled or so shaped as to present a wedge-shaped or eccentric edge or end adapted to be turned beneath said rounded head in locked position, and turned to one side or above said head in unlocked position.

In its broader features, the invention is an improvement on the Peckham last, Ser. No. 400,763, filed Nov. 5, 1907.

In the drawings, Figure 1 shows a preferred embodiment of my invention applied to one form of divided last, the latter being shown 'in partial central vertical section; Fig. 2 is a top plan view thereof; Fig. 3 is a view similar to Fig. 1 of a slightly different form; and Fig. I shows the same, looking fromthe rear in line with the stud.

The last may be of any construction de sired, being herein shown as comprising a forepart 1 and a heel-part 2 connected by a Specification of Letters Patent.

Application filed November 11, 1908.

Patented Aug. 2, 1910.

Serial No. 462,046.

link-hinge or union 3 to permit the heelpart to turn from the full-line position, Fig. 1, to the dotted line position.

In carrying out my invention, in its preferred construction, I bore a hole 4 in one of the last-parts, preferably the heel-part, and mount therein a bolt or cylindrical pin or post 5, preferably but not necessarily threaded as indicated at 6 to be rotated by a handle or other turning means 7 the outer end of said bolt or post being beveled so as to provide a wedge-shaped eccentric lip or end 8. Cooperating with the latter is a stud, shoulder or button-shaped projection, shown as preferably a rounded head 9 of a nail or tack 10, Figs. 1 and 2, or post 11, Fig. 3. This is driven or secured by any suitable means in the last-part opposite the pin 5.

Preferably the pin 5 is so located with relation to the head 9 that the eccentric lip or wedge-shaped edge or end 8 is nearer or tighter against said head when in the position shown in full lines in Fig. 1, 2'. e. at the bottom of the head than when rotated a half turn to an opposite position, being for this purpose herein shown as having its rear threaded end slightly lower than the forward end, so that the pin 5 and tack 10 are out of axial alinement.

In use, when it is desired to lock the last, the pin or bolt 5 is simply rotated so as to bring the eccentric locking edge 8 under the rounded or beveled head 9 of the tack 10. The result is that the beveled end of the pin or bolt 5 wedges tightly against and beneath the head 9, rigidly locking the parts in eX- tended position; hen it is desired to unlock the last, the pin 5 is given a quarter turn so as to bring the edge 8 at one side or the other of the tack head 9, thereby permitting the free movement of the parts past each other. Inasmuch as the end 8 of the pin is beveled, and the head 9 of the tack is rounded or beveled to correspond, as shown, the parts cooperate readily and permit the desired wedging action. I prefer to thread the pin 5 as indicated at 6 so asto permit of a slight forward movement and the ready adjustment of the pin, but this may be omitted, in which latter case the depth of the hole may be depended upon to control the lengthwise position of the pin or bolt 5. The handle 7 is a convenient means of turning or rotating the pin or bolt 5, but other means may readily be supplied within the scope of my invention.

Not only is my construction inexpensive, but it requires no expensive apparatus to apply it, it being necessary merely to bore the opposite holes for the two metal parts and then insert them into place. Metal bears against metal, thereby preventing undue wear. By having the lip or eccentric wedge-lock 8 arranged to swing from a position at one side of the button or stud 9 to a position beneath the part 9 the last parts are positively locked, and by an opposite movement they are unlocked, the construction permitting said operation preferably consisting of having said lip formed eccentrically on an axially rotary pin or post, and when the latter is set out of axial alinement with said button or other part 9 a wedging or binding action takes place when the lip is swung from unlocking into locked position.

In Figs. 3 and 4: I have shown, instead of a tack 10, a heavier member 11, and have prolonged the eccentric edge 8 into a swinging arm or member 12. In either case the swinging part swings transversely of the last about an axis which is longitudinal of the last, said swinging part being pivoted 011 one last part to swing transversely of the last into wedging relation with the other last-part under a tendency to force apart the adjacent walls of the last-parts and lock them in last-lengthened position. The stud may consist of any resisting protuberance or portion of or on or in the last-part opposite the wedge-lock carrying last-part.

It will be obvious to those skilled in the art that my invention is capable of considerable variations of embodiment within the spirit and scope of the claims hereinafter set forth.

Having described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is:

1. In a last, the combination with a forepart, a heel-part, and a connecting union, of a locking device for locking said last-parts in lengthened position, comprising a stud on the secant face of one of said last-parts, and a cooperating pin mounted lengthwise of the opposite last-part to rotate axially therein, having a side lip projecting forwardly at its front end in position to swing into locking engagement beneath said stud and out of locking position at one side of said stud.

2. In a last, the combination with a forepart, a heel-part, and a connecting union, of a locking device for locking said last-parts in lengthened position, comprising a stud on the secant face of one of said last-parts, and a cooperatin screw threaded pin mounted lengthwise of the opposite last-part to rotate axially therein, having a side 11p projecting forwardly at its front end in position to swing into locking engagement beneath said stud and out of locking position at one side of said stud.

3. In a last, the combination with a forepart, a heel-part, and a connecting union, of a locking device in the form of a screwthreaded pin mounted lengthwise of one of the last-parts to rotate outwardly therefrom into locking position with relation to the opposite last-part to force apart the adjacent walls of the last-parts and lock them in lastlengthened position and to rotate backwardly thereinto to permit the last to collapse.

4. In a last, the combination with a forepart, a heel-part, and a connecting union, of a locking device for locking said last-parts in lengthened position, comprising a stud on the secant face of one of said last-parts, and a cooperating pin mounted lengthwise of the opposite last-part to rotate axially therein, having a laterally projecting operating handle and a side lip projecting forwardly at its front end in position to swing into locking engagement beneath said stud and out of locking position at one side of said stud.

5. A hinged last, having a longitudinal hole in the meeting end 0 one of the lastparts, a locking pin partially contained in said hole to rotate axially therein, having a beveled outer end, and a centrally projecting stud mounted in the secant face of the other last-part opposite said beveled end when the last is in lengthened position.

6. A hinged last, havin a longitudinal hole in the meeting end 0 one of the lastparts, a locking pin partially contained in said hole to rotate axially therein, having a beveledouter end, and a centrally projecting stud mounted in the secant face of the other last-part opposite said beveled end when the last is in lengthened position, the axes of said stud and said pin being at a slight angle to each other with their adjacent ends higher in the last than their remaining portions whereby the rotation of said pin will cause its beveled end to wedge agamstthe under side of said stud.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

WALTER A. KRENTLER.

Witnesses MINNIE R. HoEr'r, GENEVIEVE RYAN. 

